CHARACTERIZATION OF CU NANO-COLLOID PREPARED BY WIRE ELECTRIC EXPLOSION PROCESS IN LIQUID

Wire electric explosion process has been found about two hundred years ago and developed for the synthesis of nanoparticles from several ten years ago. It can be seen that energy deposited in the wire in the ohmic heating stage is larger in a dense medium. When a wire is exploded in a condensed medium, the resistance of discharge gap is higher than in air. For example, ohmic heating stage in water is almost twice as large as that in air. Wire electric explosion in liquid (WEEL) is possible to control the energy deposition in wire by changing the electrical breakdown, atomization enthalpy and expanding plasma, etc. Various kinds of liquids with different density are possible to use for medium in WEEL. Therefore, the properties of nanoparticles can be controlled by WEEL. Ink-jet printing is a kind of noncontact and direct process as a pattern on demand type. It is also possible to make a conductive metal nanoparticles pattern simply, continuously and economically. Therefore, there are many kinds of merits on ink-jet printing process considering the application field like TFT, PCB, FPD, RFID, Solar cell, etc. To apply nanoparticles to electrical printing technology, long time stability of nanoparticles without contamination in liquid is indispensable. Wire explosion process in liquid is a kind of new process to prepar